204720780 has 96 divisors (see below), whose sum is σ = 627959808. Its totient is φ = 49420800.

The previous prime is 204720751. The next prime is 204720781. The reversal of 204720780 is 87027402.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (204720781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 206085 + ... + 207075.

It is an arithmetic number, because the mean of its divisors is an integer number (6541248).

Almost surely, 2^204720780 is an apocalyptic number.

204720780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204720780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (313979904).

204720780 is an abundant number, since it is smaller than the sum of its proper divisors (423239028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204720780 is a wasteful number, since it uses less digits than its factorization.

204720780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327 (or 1325 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 204720780 is about 14308.0669553927. The cubic root of 204720780 is about 589.3690276434.

The spelling of 204720780 in words is "two hundred four million, seven hundred twenty thousand, seven hundred eighty".